scholarly journals The Accurate Volumetric Determination of Phosphoric Acid in Phosphate Rock.

1912 ◽  
Vol 4 (7) ◽  
pp. 520-522
Author(s):  
John G. Fairchild
Keyword(s):  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Volumetric Determination

Determination of uranium and radium in phosphate rock and technical phosphoric acid

1986 ◽  
Vol 324 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Farouk T. Awadalla ◽  
Fathi Habashi
Keyword(s):  
Phosphoric Acid ◽  
Phosphate Rock

The Volumetric Determination of Phosphoric Acid

1930 ◽  
Vol 13 (2) ◽  
pp. 203-207
Author(s):  
Wm H Ross
Keyword(s):  
Phosphoric Acid ◽  
Volumetric Determination

Determination of Uranium in Phosphate Rock and Wet-Process Phosphoric Acid by Argon Plasma Emission Spectrometry

1980 ◽  
Vol 63 (2) ◽  
pp. 208-210
Author(s):  
Terry C Woodis ◽  
J R Trimm ◽  
John H Holmes ◽  
Frank J Johnson
Keyword(s):  
Standard Deviation ◽  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Argon Plasma ◽  
Trioctylphosphine Oxide ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Wet Process ◽  
Plasma Emission Spectrometry

Abstract A method for determining uranium, based on extraction with trioctylphosphine oxide and measurement by argon plasma emission spectrometry at 424.17 nm, is described. Results from the argon plasma method compare favorably with results from other methods and are within 1 standard deviation of the composite average of all methods used in an 11-laboratory study.

The Volumetric Determination of Phosphoric Acid

1929 ◽  
Vol 12 (2) ◽  
pp. 170-176
Author(s):  
Wm H Ross
Keyword(s):  
Phosphoric Acid ◽  
Volumetric Determination

EINE CHEMISCHE METHODE ZUR BESTIMMUNG VON 16-EPI-ÖSTRIOL IM URIN DES MENSCHEN

1963 ◽  
Vol 44 (1) ◽  
pp. 47-66 ◽  
Author(s):  
W. Nocke ◽  
H. Breuer
Keyword(s):  
Melting Point ◽  
Phosphoric Acid ◽  
Aqueous Alkali ◽  
Percentage Error ◽  
Organic Layer ◽  
Maximum Percentage ◽  
Chemical Determination ◽  
Routine Assay ◽  
Hydrolysis Of

ABSTRACT A method for the chemical determination of 16-epi-oestriol in the urine of nonpregnant women with a qualitative sensitivity of less than 0.5 μg/24 h is described. The separation of 16-epi-oestriol and oestriol is accomplished by converting 16-epi-oestriol into its acetonide, a reaction which is stereoselective for cis-glycols and therefore not undergone by oestriol as a trans-glycol. Following partition between chloroform and aqueous alkali, the acetonide of 16-epi-oestriol is completely separated with the organic layer whereas oestriol as a strong phenol remains in the alkaline phase. 16-epi-oestriol is chromatographed on alumina as the acetonide and determined as a Kober chromogen. This procedure can easily be incorporated into the method of Brown et al. (1957 b) thus making possible the simultaneous routine assay of oestradiol-17β, oestrone, oestriol and 16-epi-oestriol from one sample of urine. The specificity of the method was established by separation of 16-epi-oestriol from nonpregnancy urine as the acetonide, hydrolysis of the acetonide by phosphoric acid, isolation of the free compound by microsublimation and identification by micro melting point, colour reactions and chromatography. The accuracy of the method is given by a mean recovery of 64% for pure crystalline 16-epi-oestriol when added to hydrolysed urine in 5–10 μg amounts. The precision is given by s = 0.24 μg/24 h. For the duplicate determination of 16-epi-oestriol the qualitative sensitivity is 0.44 μg/24 h, the maximum percentage error being ± 100% The quantitative sensitivity (±25% error) is 1.7 μg/24 h.

Overview of Current Phosphoric Acid Production Processes and a New Idea of Kiln Method

2020 ◽  
Vol 17 ◽  
Author(s):  
Guangya Zheng ◽  
Jupei Xia ◽  
Zhengjie Chen
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Phosphate Rock ◽  
Low Grade ◽  
Production Methods ◽  
Production Processes ◽  
Major Equipment ◽  
Development Prospects ◽  
Great Competitiveness

: China primarily contains medium and low-grade phosphorus ores that are used to produce phosphoric acid. Here, we provide an overview of phosphoric acid production processes, including wet, thermal, and kiln methods, as well as the fundamental principles, major equipment, and technological aspects of each process. Progress in the kiln method using lowgrade phosphate rock is described, which involves the KPA and CDK processes. The literature shows that the addition of admixtures adds great competitiveness to kiln phosphate production methods and has considerable development prospects.

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